The staff seem to be mostly ASU students, so they don't always seem fully awake in the morning. I've never had them be rude to me but every now and then they mix up a drink or something doesn't get communicated from cashier to barista. I sit here a lot to study and while the regulars don't get bothered over an occasional mix-up, it's fun to watch first-timers get irritated and shaking their heads to each other as they walk out the door and begin verbally pre-drafting their 1 - star reviews.
The location is very convenient and lines are significantly less than at the Arizona center location. But remember that this is basically a college campus Starbucks, at the bottom floor of a college dorm, and that will either grow on you and you"ll get to know the kids that run it, or you'll let your day be ruined when the occasional mistake gets made by a groggy student.
I know there are a bunch of low rated reviews on yelp, but again, from observing customers here I think that most people have too much of a hair trigger for what sets them off when it comes to customer service. If you've been treated rudely that's one thing, but if you're simply dealing with a delay, cut these kids some slack and don't blast them on yelp.